It's a bit of a chicken and egg situation this!!
My current amp can sound good but it won't do everything I need it to. If I simply get a new amp that can do more and do it effectively I'll need to get a combo as the room I practice in at the house is VERY small and I need an amp to practice with. A 1X12 would be adequate as I disconnect the internal speaker when I hook it up to the 4X12 anyway. I'm not even sure a 2X12 combo would fit in the room! :)
Conversely, if the new amp still can't do everything I need it to (great distortions but terrible cleans or the other way around etc.) then I'll need to go the amp modelling route and sell the individual pedals to expand the options available, in which case I'll get an RP1000. However, if I do that, I can just use the RP1000 with headphones for practice and therefore I no longer need a combo and could simply get a head unit. In fact, I may not even need a guitar amp as I could use a Marshall EL34 50/50.
I just don't know what to do for the best, especially as I'm stuck in Lincolnshire where I can't get to try most of this gear!